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Upper Post Lake
Enhanced dataInteractive depth contours
Upper Post LakeLanglade County, WI
Contours load with map Access
Interactive depth contours5-foot typical interval · Sonar-derived depth (C-MAP Genesis) · Gaps interpolated · Not for navigation
Source: C-MAP Genesis community sonar (derived)high confidence · QA passed · Select a contour to inspect its mapped depthDepths decoded from C-MAP Genesis Social Map community sonar recordings (used with permission), covering 25% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 14-ft maximum depth. More accurate than a pure model, but still an estimate. Not for navigation.LakeList assistant
Plan your lake day
Fishing spots, food, lodging, marinas, and rentals around Upper Post Lake.
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Fishing forecast
Best windows for Upper Post Lake
Weather-based planning built from the National Weather Service hourly forecast near this lake.
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Checking wind, precipitation, and near-term weather windows.
Water temperature
Upper Post Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
77°FPeak summer
Seasonal estimate. Checking current National Weather Service air temperatures…
Warmest water of the year. Fish hold deeper or feed in low light; swimming and watersports are at their best.
Estimates are modeled, not measured. Actual temperatures vary with depth, wind mixing, and recent weather — verify conditions before swimming, boating, or heading onto ice.
Wisconsin DNR water assessment
Impaired waterbody listed
The DNR lists this waterbody as impaired. This notice is not itself a closure; review the official assessment and current guidance before your trip.
303(d) / impairment recordRecreation restrictions noted
Excess Algal GrowthPollutants: Total Phosphorus, Unknown Pollutant
- Status
- TMDL Approved, Pollutant Removed
- Public health
- General Advice
- Recreation
- Recreational Restrictions
- Aquatic life
- Not specified
Water is impaired due to one or more pollutants and associated quality impacts.
Review DNR water quality Check consumption advice Source updated 2025-02-10 · LakeList verified 2026-07-12
DNR water check
Water quality quick take
Historical volunteer-monitoring record for this lake.
Last sampled Sep 2018Volunteer monitoring 2008–2018
DNR volunteers monitored this lake for about 10 years, ending in 2018. Its final monitored summers showed hazy water (~3 ft Secchi) in 2016, high algae (chlorophyll ~28 µg/L) in 2017, and high nutrients (phosphorus ~65 µg/L) in 2012. After 8 years without samples, these readings describe the lake as it was, not as it is.
The DNR station record reports activity through 2019, but LakeList holds no readings after 2018 — check the station reports for anything newer.
| Year | Secchi | Chlorophyll-a | Total phosphorus |
|---|---|---|---|
| 2018 | — | 20.0 µg/L (1) | — |
| 2017 | — | 28.0 µg/L (2) | — |
| 2016 | 3.0 ft (2) | 23.5 µg/L (2) | 34.0 µg/L (1) |
| 2015 | 3.0 ft (2) | 16.0 µg/L (2) | — |
| 2013 | 2.5 ft (2) | 41.5 µg/L (2) | — |
| 2012 | 2.3 ft (2) | 64.0 µg/L (2) | 65.0 µg/L (2) |
Upper Post Lake - Deep HoleStation 343136
Historical record only — no current water-quality data exists for this lake. LakeList verified 2026-07-12.Official Wisconsin information
Plan with DNR sources
LakeList links to the authoritative record so you can verify maps, rules, and current notices before leaving.
Historical DNR depth maps1 converted map sheetView DNR depth mapHistorical map · not for navigationFishing regulationsVerify current seasons, limits, and restrictionsOfficial DNR lake pageFacts, advisories, boating, and water qualityWater quality reportsMonitoring stations, clarity, and DNR reportsInvasive speciesVerified, observed, and historical AIS recordsBoating ordinancesLocal slow-no-wake and water-use restrictionsFish consumption advisoriesStatewide and waterbody-specific health guidance
Historical depth maps are not for navigation. Verify regulations and access at the official source before your trip.
Historical Wisconsin DNR maps
Upper Post Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Upper Post Lake · sheet 1
Pan, zoom, and inspect the converted Wisconsin DNR historical map image in the browser. Historical survey — not for navigation.
Source: Wisconsin DNR · WBIC 399200 · image navigation only; spatial alignment pending · Historical lake maps are not for navigation.
Source: Wisconsin Department of Natural Resources. Converted for browser access with source URLs, checksums, and retrieval dates retained. Historical lake maps are not for navigation.
Wisconsin DNR · 2026–2027 season
Lake-specific fishing regulations
Rule text published by the DNR for this waterbody, cached by WBIC and verified 2026-07-12.
All species
This lake may be in more than 1 county. Follow the trolling regulations for the county in which you are fishing. A list of counties and waters that allow motor trolling with 3 hooks, baits, or lures per angler can be found at http://dnr.wi.gov/topic/fishing/questions/troll.html. All other waters allow motor trolling with 1 hook, bait or lure per angler, and no more than 2 hooks, baits, or lures per boat.
Catfish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 10.
Cisco and whitefish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 10.
Lake sturgeon
Season Dates: Closed. No fishing allowed.
Largemouth and smallmouth bass
Season Dates: June 20, 2026 to March 7, 2027. The minimum length limit is 14" and the daily bag limit is 5.
Muskellunge and hybrids
Season Dates: May 2, 2026 to December 31, 2026 on open water. The minimum length limit is 40" and the daily bag limit is 1.
Northern pike
Season Dates: May 2, 2026 to March 7, 2027. The minimum length limit is 26" and the daily bag limit is 2.
Paddlefish
Season Dates: Closed. No fishing allowed.
Panfish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 25.
Rock, yellow, and white bass
Season Dates: Open All Year. No minimum length limit and the daily bag limit is unlimited.
Rough fish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is unlimited.
Shovelnose sturgeon
Season Dates: Closed. No fishing allowed.
Trout and salmon
See Trout regulations layer.
Urban waters gamefish
This waterbody is not considered an urban water, Urban Waters Gamefish regulations do not apply.
Walleye, sauger, and hybrids
Season Dates: May 2, 2026 to March 7, 2027. The minimum length is 15", but walleye, sauger, and hybrids from 20" to 24" may not be kept, and only 1 fish over 24" is allowed. The daily bag limit is 3.
Regulations can change. The official DNR page controls; verify seasons, boundaries, bag limits, and emergency rules before fishing.
765surface acres
14max depth feet
2public access points
45.4573, -89.0829latitude, longitude
Access
Public access points
Boat launchUpper Post Lake - South Access45.44497, -89.08163Managed by TOWNSHIPTOWN OF ELCHORamp surface: PavedADA-accessible feature: NoVerified 2026-07-12
Boat launchUpper Post Lake - West Access45.45602, -89.08955Managed by TOWNSHIPTOWN OF ELCHORamp surface: GravelADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Northern PikePanfishLargemouth BassMuskySmallmouth BassWalleye
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2025, when 7,570 fish were recorded across 1 entry.
2025
WalleyeLake Michigan · Large Fingerling
7,5707.2 in average
2023
WalleyeLake Michigan · Large Fingerling
7,5457.0 in average
2021
WalleyeLake Michigan · Large Fingerling
7,5707.6 in average
2019
WalleyeLake Michigan · Large Fingerling
7,5707.0 in average
2017
WalleyeMississippi Headwaters · Large Fingerling
7,6527.4 in average
2015
WalleyeLake Michigan · Large Fingerling
7,6527.3 in average
2013
WalleyeLake Michigan · Large Fingerling
3,7837.5 in average
2012
WalleyeLake Michigan · Small Fingerling
17,3431.6 in average
2011
WalleyeLake Michigan · Large Fingerling
5,8977.0 in average
Depth FAQ
How deep is Upper Post Lake?
Upper Post Lake is 14 feet deep at its deepest point and averages about 6 feet, according to Wisconsin DNR records.
Is there a free depth map of Upper Post Lake?
Yes. LakeList publishes a free interactive depth contour map of Upper Post Lake at a typical 5-foot interval, with an optional 3D underwater view, derived from C-MAP Genesis community sonar (derived) survey data.
Where does the Upper Post Lake depth map come from?
The interactive depth contours are derived from C-MAP Genesis community sonar (derived). Each contour set passes a visual QA review against the source document before it is published. The depths are derived from community sonar recordings (C-MAP Genesis Social Map, used with permission), with gaps between recordings interpolated; not for navigation.
Trust and freshness
Where this lake data comes from
Wisconsin DNR Lake Mapsname, coordinates, county, source identifiers
LakeList record updated 2026-07-14
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